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Copy file name to clipboardExpand all lines: pages/insights/20260115_human_ai_ladder.md
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description: Where does AI rank among public solutions by human programmers?
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authors: John Yang
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**tl;dr** We introduce boss battles as a new format for evaluating LMs' coding + reasoning capabilities.
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We pit [Claude 4.5 Sonnet against <imgsrc="/static/images/insights/20251108_human_ai/gigachad.jpg"class="img-inline"style="height:1.2rem;margin-right:0em;" /> GigaChad](/insights/20251105_human_ai/) in [RobotRumble](/arenas/robotrumble) and found that today's best coding models still struggle heavily to develop suboptimal codebases into ones that rival the best human written solutions.
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Inspired by this finding, we introduce **CC:Ladder**, a twist that makes evaluating LMs as competitive, long-horizon software developers **hill-climable** and **cheaper**.
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**tl;dr**
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## How it works
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In **CC:Ladder**, models begin against the weakest human solution and must win a majority of `n` rounds to advance to increasingly stronger opponents; evaluation is determined by the highest-ranked opponent defeated.
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On Core War
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* <imgsrc="/static/images/orgs/anthropic.svg"class="img-inline"style="height:1rem;margin-right:0em;"/> Claude Sonnet 4.5 reaches
* <imgsrc="/static/images/orgs/google.svg"class="img-inline"style="height:1rem;margin-right:0em;"/> Gemini 3 Pro reaches*[coming soon]*
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## How to run?
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## Relationship between CC:Ladder & CodeClash
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We encourage practitioners to...
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- Use **CC:Ladder** for development.
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- Once your model / scaffold / AI system is finalized, run evaluation against other models on CodeClash proper.
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For Pokémon fans, **CC:Ladder** is the equivalent of the [Elite 4](https://pokemon.fandom.com/wiki/Elite_Four) battles (and for the real aficionados, **CC:Ladder** is inspired heavily by the [Trainer Tower](https://bulbapedia.bulbagarden.net/wiki/Trainer_Tower)).
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CodeClash is the real world [Video Game Championships](https://en.wikipedia.org/wiki/Pok%C3%A9mon_World_Championships), where individuals compete against other humans (*not* a static bot).
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As with the Elite Four, <b>CC:Ladder</b> tests progression against fixed opponents, whereas CodeClash reflects real competition by measuring performance against intelligent competitors.
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</div>
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We recommend CC:Ladder be treated as a proper evaluation as well.
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Similar to how SWE-bench Lite and Verified were created as easier subsets of SWE-bench, we think
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CodeClash remains the north-star evaluation.
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Competition against dynamic, intelligent competition is more challenging than static solutions.
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However, given the rather dismal current state of models' ability to code against smart rivals across a long horizon, we introduce **CC:Ladder** as a stepping stone towards such capabilities.
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